Lovato DM3T0250 solid-core current transformer with a 250/5 A transformation ratio, 30 mm cable opening, class 1 accuracy and 5 VA burden for electrical current measurement.
£26.68
The Lovato DM3T0250 is a reliable solid-core current transformer designed for accurate current measurement in industrial switchboards, electrical distribution panels and energy-monitoring systems. Featuring a 250/5 A transformation ratio, it converts a primary current of up to 250 A into a standard 5 A secondary output for connection to compatible energy meters, ammeters, multifunction measuring instruments and power analysers.
Its solid-core construction provides a secure and durable measuring solution for new electrical installations where the primary conductor can be routed through the transformer during panel assembly. The DM3T0250 accepts round cables up to 30 mm in diameter and several commonly used rectangular busbar sizes, making it suitable for panel-building, machinery and power-distribution applications.
Operating across a 50–60 Hz frequency range, the transformer provides a rated burden of 5 VA at accuracy class 1. Its compact housing, Faston secondary terminals and flexible DIN rail or screw mounting options help simplify installation while supporting dependable long-term current measurement.
Current transformers provide a safe method of measuring high electrical currents by converting the primary current into a proportional lower-current output for compatible instrumentation. The Lovato DM3T0250 converts a primary current of up to 250 A into a standard 5 A secondary signal, allowing meters and monitoring devices to measure electrical loads without being connected directly to the high-current circuit.
The solid-core construction is particularly suited to new switchboard and control-panel assemblies. During installation, the cable or busbar is passed through the transformer opening before the primary circuit is connected. This creates a secure arrangement for continuous energy measurement, electrical load monitoring and power-system analysis.
| Current | 5 A |
|---|---|
| Manufacturer | Lovato Electric |
| Series | DM3T |
| Model | DM3T0250 |
| Product type | Solid-core current transformer |
| Primary current | 250 A |
| Secondary current | 5 A |
| Transformation ratio | 250/5 A |
| Cable opening diameter | 30 mm |
| Compatible busbars | 40 × 10 mm, 30 × 20 mm and 25 × 25 mm |
| Accuracy class | Class 1 |
| Rated burden | 5 VA |
| Operating frequency | 50–60 Hz |
| Continuous overload withstand | 120% of rated primary current |
| Rated insulation voltage | 720 V |
| Short-time thermal current | 40–60 × rated primary current for 1 second |
| Rated dynamic current | 2.5 × short-time thermal current |
| Insulation type | Dry, class E |
| Terminal type | Faston |
| Mounting method | DIN rail or screw fixing |
| Protection rating | IP30 |
| Operating temperature | -25°C to +50°C |
| Storage temperature | -40°C to +80°C |
| Maximum relative humidity | 90% |
| Conformity | IEC/EN/BS 61869-1 and IEC/EN/BS 61869-2 |
| Certification | EAC |
| Product weight | approx. 260 g |
| Packaged weight | approx. 340 g |
| Package dimensions | 75 × 65 × 85 mm |
| EAN | 8013975121856 |
| HS Code | 85389091 |
The DM3T0250 is used to measure electrical currents in switchboards, distribution panels and energy-monitoring systems. It converts a primary current of up to 250 A into a standard 5 A secondary output.
The current transformer has a 250/5 A transformation ratio, meaning that a nominal primary current of 250 A corresponds to a 5 A secondary current.
The transformer accommodates a round cable with a maximum diameter of approximately 30 mm.
The transformer is suitable for rectangular busbars measuring 40 × 10 mm, 30 × 20 mm or 25 × 25 mm.
No. The DM3T0250 has a solid-core construction, so the conductor must be disconnected or passed through the transformer during panel assembly. A split-core transformer is more suitable when an existing conductor cannot be removed.
Lovato Electric current transformers are widely used by panel builders, electrical contractors and industrial engineers to provide reliable current measurement, straightforward installation and dependable integration with modern energy-monitoring equipment.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...